Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fa6d7480e2fe64…

MALICIOUS

PDF

77.6 KB Created: 2021-08-31 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc66174f3c6deb1e22e827e912c7b1be SHA-1: 8af06f58816dabba29915c47bfb8381c5df0394c SHA-256: 80fa6d7480e2fe6474cdd013d1647ea77b715ea0d7cf342cadf6b55a1974b7ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://abofahed.com/userfiles/file/69986639453.pdf In PDF document text
    • http://www.deep2001.com/images/library/File/kubago.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71b88f77---5916803410.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609042f79183e---26538291150.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85fab740a1---rawibofotutaxofa.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062713470030.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/011ae273d442d0f3e6dbe15078ea66b8/2981822755.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/bece0ca7e75f52d5aed662239c0b2ee5/wefolonobaxuz.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/xinadogafizu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dcbc8fcf6---55565692880.pdfIn PDF document text
    • http://tyextractor.com/d/files/midejuxuruwisidowobedij.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/fujiz.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a7c58827e9a1197ebc5e19bb74ce5442/25152586056.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d2e2082e---36243032820.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/d420d5c3c95bdb582df3fea3caf10c55/32481797662.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/92021642722.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2719ef7a---lonifef.pdfIn PDF document text
    • https://grandmake.com/userfiles/nogarizejaletawopof.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/90538841975.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/falokeparesawadisubegi.pdfIn PDF document text
    • http://stylekd.ru/files/58153115360.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/demalasipow.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/27003130336.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ac946808---24160147747.pdfIn PDF document text
    • http://fygl.net/uploads/file/310255283169.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/28231259381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=party+rock+anthem+chordsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 17328 bytes
SHA-256: 92faabac9ba5ffda4b781ee1216786ed7fae1923311cb8ecc879fcb3d5eeeba5
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 10704 bytes
SHA-256: 5a368f31832f7c2e2b23a87b7eefe019308924c0d3bb1782cffc020eb11e0dd2
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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